<!DOCTYPE html><html><head><meta charset="utf-8"><style>body {
  width: 45em;
  border: 1px solid #ddd;
  outline: 1300px solid #fff;
  margin: 16px auto;
}

body .markdown-body
{
  padding: 30px;
}

@font-face {
  font-family: fontawesome-mini;
  src: url(data:font/woff;charset=utf-8;base64,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) format('woff');
}

@font-face {
  font-family: octicons-anchor;
  src: url(data:font/woff;charset=utf-8;base64,d09GRgABAAAAAAYcAA0AAAAACjQAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAABGRlRNAAABMAAAABwAAAAca8vGTk9TLzIAAAFMAAAARAAAAFZG1VHVY21hcAAAAZAAAAA+AAABQgAP9AdjdnQgAAAB0AAAAAQAAAAEACICiGdhc3AAAAHUAAAACAAAAAj//wADZ2x5ZgAAAdwAAADRAAABEKyikaNoZWFkAAACsAAAAC0AAAA2AtXoA2hoZWEAAALgAAAAHAAAACQHngNFaG10eAAAAvwAAAAQAAAAEAwAACJsb2NhAAADDAAAAAoAAAAKALIAVG1heHAAAAMYAAAAHwAAACABEAB2bmFtZQAAAzgAAALBAAAFu3I9x/Nwb3N0AAAF/AAAAB0AAAAvaoFvbwAAAAEAAAAAzBdyYwAAAADP2IQvAAAAAM/bz7t4nGNgZGFgnMDAysDB1Ml0hoGBoR9CM75mMGLkYGBgYmBlZsAKAtJcUxgcPsR8iGF2+O/AEMPsznAYKMwIkgMA5REMOXicY2BgYGaAYBkGRgYQsAHyGMF8FgYFIM0ChED+h5j//yEk/3KoSgZGNgYYk4GRCUgwMaACRoZhDwCs7QgGAAAAIgKIAAAAAf//AAJ4nHWMMQrCQBBF/0zWrCCIKUQsTDCL2EXMohYGSSmorScInsRGL2DOYJe0Ntp7BK+gJ1BxF1stZvjz/v8DRghQzEc4kIgKwiAppcA9LtzKLSkdNhKFY3HF4lK69ExKslx7Xa+vPRVS43G98vG1DnkDMIBUgFN0MDXflU8tbaZOUkXUH0+U27RoRpOIyCKjbMCVejwypzJJG4jIwb43rfl6wbwanocrJm9XFYfskuVC5K/TPyczNU7b84CXcbxks1Un6H6tLH9vf2LRnn8Ax7A5WQAAAHicY2BkYGAA4teL1+yI57f5ysDNwgAC529f0kOmWRiYVgEpDgYmEA8AUzEKsQAAAHicY2BkYGB2+O/AEMPCAAJAkpEBFbAAADgKAe0EAAAiAAAAAAQAAAAEAAAAAAAAKgAqACoAiAAAeJxjYGRgYGBhsGFgYgABEMkFhAwM/xn0QAIAD6YBhwB4nI1Ty07cMBS9QwKlQapQW3VXySvEqDCZGbGaHULiIQ1FKgjWMxknMfLEke2A+IJu+wntrt/QbVf9gG75jK577Lg8K1qQPCfnnnt8fX1NRC/pmjrk/zprC+8D7tBy9DHgBXoWfQ44Av8t4Bj4Z8CLtBL9CniJluPXASf0Lm4CXqFX8Q84dOLnMB17N4c7tBo1AS/Qi+hTwBH4rwHHwN8DXqQ30XXAS7QaLwSc0Gn8NuAVWou/gFmnjLrEaEh9GmDdDGgL3B4JsrRPDU2hTOiMSuJUIdKQQayiAth69r6akSSFqIJuA19TrzCIaY8sIoxyrNIrL//pw7A2iMygkX5vDj+G+kuoLdX4GlGK/8Lnlz6/h9MpmoO9rafrz7ILXEHHaAx95s9lsI7AHNMBWEZHULnfAXwG9/ZqdzLI08iuwRloXE8kfhXYAvE23+23DU3t626rbs8/8adv+9DWknsHp3E17oCf+Z48rvEQNZ78paYM38qfk3v/u3l3u3GXN2Dmvmvpf1Srwk3pB/VSsp512bA/GG5i2WJ7wu430yQ5K3nFGiOqgtmSB5pJVSizwaacmUZzZhXLlZTq8qGGFY2YcSkqbth6aW1tRmlaCFs2016m5qn36SbJrqosG4uMV4aP2PHBmB3tjtmgN2izkGQyLWprekbIntJFing32a5rKWCN/SdSoga45EJykyQ7asZvHQ8PTm6cslIpwyeyjbVltNikc2HTR7YKh9LBl9DADC0U/jLcBZDKrMhUBfQBvXRzLtFtjU9eNHKin0x5InTqb8lNpfKv1s1xHzTXRqgKzek/mb7nB8RZTCDhGEX3kK/8Q75AmUM/eLkfA+0Hi908Kx4eNsMgudg5GLdRD7a84npi+YxNr5i5KIbW5izXas7cHXIMAau1OueZhfj+cOcP3P8MNIWLyYOBuxL6DRylJ4cAAAB4nGNgYoAALjDJyIAOWMCiTIxMLDmZedkABtIBygAAAA==) format('woff');
}

.markdown-body {
  font-family: sans-serif;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  color: #333333;
  overflow: hidden;
  font-family: "Helvetica Neue", Helvetica, "Segoe UI", Arial, freesans, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  word-wrap: break-word;
}

.markdown-body a {
  background: transparent;
}

.markdown-body a:active,
.markdown-body a:hover {
  outline: 0;
}

.markdown-body b,
.markdown-body strong {
  font-weight: bold;
}

.markdown-body mark {
  background: #ff0;
  color: #000;
  font-style: italic;
  font-weight: bold;
}

.markdown-body sub,
.markdown-body sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}
.markdown-body sup {
  top: -0.5em;
}
.markdown-body sub {
  bottom: -0.25em;
}

.markdown-body h1 {
  font-size: 2em;
  margin: 0.67em 0;
}

.markdown-body img {
  border: 0;
}

.markdown-body hr {
  -moz-box-sizing: content-box;
  box-sizing: content-box;
  height: 0;
}

.markdown-body pre {
  overflow: auto;
}

.markdown-body code,
.markdown-body kbd,
.markdown-body pre,
.markdown-body samp {
  font-family: monospace, monospace;
  font-size: 1em;
}

.markdown-body input {
  color: inherit;
  font: inherit;
  margin: 0;
}

.markdown-body html input[disabled] {
  cursor: default;
}

.markdown-body input {
  line-height: normal;
}

.markdown-body input[type="checkbox"] {
  box-sizing: border-box;
  padding: 0;
}

.markdown-body table {
  border-collapse: collapse;
  border-spacing: 0;
}

.markdown-body td,
.markdown-body th {
  padding: 0;
}

.markdown-body .codehilitetable {
  border: 0;
  border-spacing: 0;
}

.markdown-body .codehilitetable tr {
  border: 0;
}

.markdown-body .codehilitetable pre,
.markdown-body .codehilitetable div.codehilite {
  margin: 0;
}

.markdown-body .linenos,
.markdown-body .code,
.markdown-body .codehilitetable td {
  border: 0;
  padding: 0;
}

.markdown-body td:not(.linenos) .linenodiv {
  padding: 0 !important;
}

.markdown-body .code {
  width: 100%;
}

.markdown-body .linenos div pre,
.markdown-body .linenodiv pre,
.markdown-body .linenodiv {
  border: 0;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  -webkit-border-top-left-radius: 3px;
  -webkit-border-bottom-left-radius: 3px;
  -moz-border-radius-topleft: 3px;
  -moz-border-radius-bottomleft: 3px;
  border-top-left-radius: 3px;
  border-bottom-left-radius: 3px;
}

.markdown-body .code div pre,
.markdown-body .code div {
  border: 0;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  -webkit-border-top-right-radius: 3px;
  -webkit-border-bottom-right-radius: 3px;
  -moz-border-radius-topright: 3px;
  -moz-border-radius-bottomright: 3px;
  border-top-right-radius: 3px;
  border-bottom-right-radius: 3px;
}

.markdown-body * {
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

.markdown-body input {
  font: 13px Helvetica, arial, freesans, clean, sans-serif, "Segoe UI Emoji", "Segoe UI Symbol";
  line-height: 1.4;
}

.markdown-body a {
  color: #4183c4;
  text-decoration: none;
}

.markdown-body a:hover,
.markdown-body a:focus,
.markdown-body a:active {
  text-decoration: underline;
}

.markdown-body hr {
  height: 0;
  margin: 15px 0;
  overflow: hidden;
  background: transparent;
  border: 0;
  border-bottom: 1px solid #ddd;
}

.markdown-body hr:before,
.markdown-body hr:after {
  display: table;
  content: " ";
}

.markdown-body hr:after {
  clear: both;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin-top: 15px;
  margin-bottom: 15px;
  line-height: 1.1;
}

.markdown-body h1 {
  font-size: 30px;
}

.markdown-body h2 {
  font-size: 21px;
}

.markdown-body h3 {
  font-size: 16px;
}

.markdown-body h4 {
  font-size: 14px;
}

.markdown-body h5 {
  font-size: 12px;
}

.markdown-body h6 {
  font-size: 11px;
}

.markdown-body blockquote {
  margin: 0;
}

.markdown-body ul,
.markdown-body ol {
  padding: 0;
  margin-top: 0;
  margin-bottom: 0;
}

.markdown-body ol ol,
.markdown-body ul ol {
  list-style-type: lower-roman;
}

.markdown-body ul ul ol,
.markdown-body ul ol ol,
.markdown-body ol ul ol,
.markdown-body ol ol ol {
  list-style-type: lower-alpha;
}

.markdown-body dd {
  margin-left: 0;
}

.markdown-body code,
.markdown-body pre,
.markdown-body samp {
  font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
  font-size: 12px;
}

.markdown-body pre {
  margin-top: 0;
  margin-bottom: 0;
}

.markdown-body kbd {
  background-color: #e7e7e7;
  background-image: -moz-linear-gradient(#fefefe, #e7e7e7);
  background-image: -webkit-linear-gradient(#fefefe, #e7e7e7);
  background-image: linear-gradient(#fefefe, #e7e7e7);
  background-repeat: repeat-x;
  border-radius: 2px;
  border: 1px solid #cfcfcf;
  color: #000;
  padding: 3px 5px;
  line-height: 10px;
  font: 11px Consolas, "Liberation Mono", Menlo, Courier, monospace;
  display: inline-block;
}

.markdown-body>*:first-child {
  margin-top: 0 !important;
}

.markdown-body>*:last-child {
  margin-bottom: 0 !important;
}

.markdown-body .headeranchor-link {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  display: block;
  padding-right: 6px;
  padding-left: 30px;
  margin-left: -30px;
}

.markdown-body .headeranchor-link:focus {
  outline: none;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  position: relative;
  margin-top: 1em;
  margin-bottom: 16px;
  font-weight: bold;
  line-height: 1.4;
}

.markdown-body h1 .headeranchor,
.markdown-body h2 .headeranchor,
.markdown-body h3 .headeranchor,
.markdown-body h4 .headeranchor,
.markdown-body h5 .headeranchor,
.markdown-body h6 .headeranchor {
  display: none;
  color: #000;
  vertical-align: middle;
}

.markdown-body h1:hover .headeranchor-link,
.markdown-body h2:hover .headeranchor-link,
.markdown-body h3:hover .headeranchor-link,
.markdown-body h4:hover .headeranchor-link,
.markdown-body h5:hover .headeranchor-link,
.markdown-body h6:hover .headeranchor-link {
  height: 1em;
  padding-left: 8px;
  margin-left: -30px;
  line-height: 1;
  text-decoration: none;
}

.markdown-body h1:hover .headeranchor-link .headeranchor,
.markdown-body h2:hover .headeranchor-link .headeranchor,
.markdown-body h3:hover .headeranchor-link .headeranchor,
.markdown-body h4:hover .headeranchor-link .headeranchor,
.markdown-body h5:hover .headeranchor-link .headeranchor,
.markdown-body h6:hover .headeranchor-link .headeranchor {
  display: inline-block;
}

.markdown-body h1 {
  padding-bottom: 0.3em;
  font-size: 2.25em;
  line-height: 1.2;
  border-bottom: 1px solid #eee;
}

.markdown-body h2 {
  padding-bottom: 0.3em;
  font-size: 1.75em;
  line-height: 1.225;
  border-bottom: 1px solid #eee;
}

.markdown-body h3 {
  font-size: 1.5em;
  line-height: 1.43;
}

.markdown-body h4 {
  font-size: 1.25em;
}

.markdown-body h5 {
  font-size: 1em;
}

.markdown-body h6 {
  font-size: 1em;
  color: #777;
}

.markdown-body p,
.markdown-body blockquote,
.markdown-body ul,
.markdown-body ol,
.markdown-body dl,
.markdown-body table,
.markdown-body pre,
.markdown-body .admonition {
  margin-top: 0;
  margin-bottom: 16px;
}

.markdown-body hr {
  height: 4px;
  padding: 0;
  margin: 16px 0;
  background-color: #e7e7e7;
  border: 0 none;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 2em;
}

.markdown-body ul ul,
.markdown-body ul ol,
.markdown-body ol ol,
.markdown-body ol ul {
  margin-top: 0;
  margin-bottom: 0;
}

.markdown-body li>p {
  margin-top: 16px;
}

.markdown-body dl {
  padding: 0;
}

.markdown-body dl dt {
  padding: 0;
  margin-top: 16px;
  font-size: 1em;
  font-style: italic;
  font-weight: bold;
}

.markdown-body dl dd {
  padding: 0 16px;
  margin-bottom: 16px;
}

.markdown-body blockquote {
  padding: 0 15px;
  color: #777;
  border-left: 4px solid #ddd;
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</style><title>README</title></head><body><article class="markdown-body"><h1 id="api"><a name="user-content-api" href="#api" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>API服务端架构代码</h1>
<div class="toc">
<ul>
<li><a href="#api">API服务端架构代码</a><ul>
<li><a href="#1">1. 部署说明</a><ul>
<li><a href="#11">1.1. 数据库相关</a></li>
<li><a href="#12">1.2. 目录相关</a></li>
</ul>
</li>
<li><a href="#2-api">2. API文档及开发规范</a><ul>
<li><a href="#21-api">2.1. API调用协议</a><ul>
<li><a href="#211">2.1.1. 请求地址及请求方式</a></li>
<li><a href="#212">2.1.2. 公共参数</a></li>
<li><a href="#213">2.1.3. 业务参数</a></li>
<li><a href="#214">2.1.4. 签名规则</a></li>
<li><a href="#215">2.1.5. 返回结果</a></li>
</ul>
</li>
<li><a href="#22-api">2.2. API开发规范</a><ul>
<li><a href="#221-apimethod">2.2.1. API接口命名规范（method）</a></li>
<li><a href="#222">2.2.2. 错误码</a></li>
<li><a href="#223-api-demo">2.2.3. API DEMO 示例</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<h2 id="1"><a name="user-content-1" href="#1" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>1. 部署说明</h2>
<blockquote>
<p>现有API基于laravel框架开发，本次介绍也针对laravel。可根据文档自行调整，以适用其他框架下使用</p>
</blockquote>
<h3 id="11"><a name="user-content-11" href="#11" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>1.1. 数据库相关</h3>
<p>执行如下SQL语句</p>
<div class="codehilite"><pre><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="o">`</span><span class="n">prefix_apps</span><span class="o">`</span> <span class="p">(</span>
  <span class="o">`</span><span class="n">id</span><span class="o">`</span> <span class="nb">INT</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="n">AUTO_INCREMENT</span> <span class="k">COMMENT</span> <span class="s1">&#39;自增长&#39;</span><span class="p">,</span>
  <span class="o">`</span><span class="n">app_id</span><span class="o">`</span> <span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">60</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="k">COMMENT</span> <span class="s1">&#39;appid&#39;</span><span class="p">,</span>
  <span class="o">`</span><span class="n">app_secret</span><span class="o">`</span> <span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="k">COMMENT</span> <span class="s1">&#39;密钥&#39;</span><span class="p">,</span>
  <span class="o">`</span><span class="n">app_name</span><span class="o">`</span> <span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="k">COMMENT</span> <span class="s1">&#39;app名称&#39;</span><span class="p">,</span>
  <span class="o">`</span><span class="n">app_desc</span><span class="o">`</span> <span class="nb">TEXT</span> <span class="k">COMMENT</span> <span class="s1">&#39;描述&#39;</span><span class="p">,</span>
  <span class="o">`</span><span class="n">status</span><span class="o">`</span> <span class="n">TINYINT</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span> <span class="k">DEFAULT</span> <span class="s1">&#39;0&#39;</span> <span class="k">COMMENT</span> <span class="s1">&#39;生效状态&#39;</span><span class="p">,</span>
  <span class="o">`</span><span class="n">created_at</span><span class="o">`</span> <span class="nb">INT</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="k">DEFAULT</span> <span class="s1">&#39;0&#39;</span> <span class="k">COMMENT</span> <span class="s1">&#39;创建时间&#39;</span><span class="p">,</span>
  <span class="o">`</span><span class="n">updated_at</span><span class="o">`</span> <span class="nb">INT</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="k">DEFAULT</span> <span class="s1">&#39;0&#39;</span> <span class="k">COMMENT</span> <span class="s1">&#39;更新时间&#39;</span><span class="p">,</span>
  <span class="k">PRIMARY</span> <span class="k">KEY</span> <span class="p">(</span><span class="o">`</span><span class="n">id</span><span class="o">`</span><span class="p">),</span>
  <span class="k">UNIQUE</span> <span class="k">KEY</span> <span class="o">`</span><span class="n">app_id</span><span class="o">`</span> <span class="p">(</span><span class="o">`</span><span class="n">app_id</span><span class="o">`</span><span class="p">),</span>
  <span class="k">KEY</span> <span class="o">`</span><span class="n">status</span><span class="o">`</span> <span class="p">(</span><span class="o">`</span><span class="n">status</span><span class="o">`</span><span class="p">)</span>
<span class="p">)</span> <span class="n">ENGINE</span><span class="o">=</span><span class="n">INNODB</span> <span class="k">DEFAULT</span> <span class="n">CHARSET</span><span class="o">=</span><span class="n">utf8</span> <span class="k">COMMENT</span><span class="o">=</span><span class="s1">&#39;应用表&#39;</span><span class="p">;</span>
</pre></div>


<h3 id="12"><a name="user-content-12" href="#12" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>1.2. 目录相关</h3>
<table>
<thead>
<tr>
<th>标题</th>
<th>路径</th>
</tr>
</thead>
<tbody>
<tr>
<td>API核心目录</td>
<td><code>app/Services/ApiServer/</code></td>
</tr>
<tr>
<td>API接口目录</td>
<td><code>app/Services/ApiServer/Response/</code></td>
</tr>
<tr>
<td>apps数据库模型</td>
<td><code>app/Models/App.php</code></td>
</tr>
<tr>
<td>路由配置</td>
<td><code>app/Http/routes.php</code></td>
</tr>
<tr>
<td>API入口控制器</td>
<td><code>app/Http/Controllers/Api/RouterController.php</code></td>
</tr>
</tbody>
</table>
<h2 id="2-api"><a name="user-content-2-api" href="#2-api" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2. API文档及开发规范</h2>
<h3 id="21-api"><a name="user-content-21-api" href="#21-api" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.1. API调用协议</h3>
<h4 id="211"><a name="user-content-211" href="#211" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.1.1. 请求地址及请求方式</h4>
<blockquote>
<p>请求地址：<code>/api/router</code>;</p>
<p>请求方式：<code>POST</code>/<code>GET</code></p>
</blockquote>
<h4 id="212"><a name="user-content-212" href="#212" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.1.2. 公共参数</h4>
<table>
<thead>
<tr>
<th>参数名</th>
<th>类型</th>
<th>是否必须</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>app_id</td>
<td>string</td>
<td>是</td>
<td>应用ID</td>
</tr>
<tr>
<td>method</td>
<td>string</td>
<td>是</td>
<td>接口名称</td>
</tr>
<tr>
<td>format</td>
<td>string</td>
<td>否</td>
<td>回调格式，默认：json（目前仅支持）</td>
</tr>
<tr>
<td>sign_method</td>
<td>string</td>
<td>否</td>
<td>签名类型，默认：md5（目前仅支持）</td>
</tr>
<tr>
<td>nonce</td>
<td>string</td>
<td>是</td>
<td>随机字符串，长度1-32位任意字符</td>
</tr>
<tr>
<td>sign</td>
<td>string</td>
<td>是</td>
<td>签名字符串，参考<a href="#签名规则">签名规则</a></td>
</tr>
</tbody>
</table>
<h4 id="213"><a name="user-content-213" href="#213" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.1.3. 业务参数</h4>
<blockquote>
<p>API调用除了必须包含公共参数外，如果API本身有业务级的参数也必须传入，每个API的业务级参数请考API文档说明。</p>
</blockquote>
<h4 id="214"><a name="user-content-214" href="#214" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.1.4. 签名规则</h4>
<ul>
<li>对所有API请求参数（包括公共参数和请求参数，但除去<code>sign</code>参数），根据参数名称的ASCII码表的顺序排序。如：<code>foo=1, bar=2, foo_bar=3, foobar=4</code>排序后的顺序是<code>bar=2, foo=1, foo_bar=3, foobar=4</code>。</li>
<li>将排序好的参数名和参数值拼装在一起，根据上面的示例得到的结果为：bar2foo1foo_bar3foobar4。</li>
<li>把拼装好的字符串采用utf-8编码，使用签名算法对编码后的字节流进行摘要。如果使用<code>MD5</code>算法，则需要在拼装的字符串前后加上app的<code>secret</code>后，再进行摘要，如：md5(secret+bar2foo1foo_bar3foobar4+secret)</li>
<li>将摘要得到的字节结果使用大写表示</li>
</ul>
<h4 id="215"><a name="user-content-215" href="#215" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.1.5. 返回结果</h4>
<div class="codehilite"><pre><span class="err">//</span> <span class="err">成功</span>
<span class="p">{</span>
    <span class="nt">&quot;status&quot;</span><span class="p">:</span> <span class="kc">true</span><span class="p">,</span>
    <span class="nt">&quot;code&quot;</span><span class="p">:</span> <span class="s2">&quot;200&quot;</span><span class="p">,</span>
    <span class="nt">&quot;msg&quot;</span><span class="p">:</span> <span class="s2">&quot;成功&quot;</span><span class="p">,</span>
    <span class="nt">&quot;data&quot;</span><span class="p">:</span> <span class="p">{</span>
        <span class="nt">&quot;time&quot;</span><span class="p">:</span> <span class="s2">&quot;2016-08-02 12:07:09&quot;</span>
    <span class="p">}</span>
<span class="p">}</span>

<span class="err">//</span> <span class="err">失败</span>
<span class="p">{</span>
    <span class="nt">&quot;status&quot;</span><span class="p">:</span> <span class="kc">false</span><span class="p">,</span>
    <span class="nt">&quot;code&quot;</span><span class="p">:</span> <span class="s2">&quot;1001&quot;</span><span class="p">,</span>
    <span class="nt">&quot;msg&quot;</span><span class="p">:</span> <span class="s2">&quot;[app_id]缺失&quot;</span>
<span class="p">}</span>
</pre></div>


<h3 id="22-api"><a name="user-content-22-api" href="#22-api" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.2. API开发规范</h3>
<h4 id="221-apimethod"><a name="user-content-221-apimethod" href="#221-apimethod" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.2.1. API接口命名规范（method）</h4>
<ul>
<li>接口名称统一小写字母</li>
<li>多单词用<code>.</code>隔开</li>
<li>对应的类文件（目录：<code>app/Services/ApiServer/Response/</code>）；以接口名去<code>.</code>，再首字母大写作为类名及文件名。如接口名：<code>user.add</code>，对应的类文件及类名为：<code>UserAdd</code></li>
<li>接口命名规范<ul>
<li>命名字母按功能或模块从大到小划分，依次编写；如后台用户修改密码：&rsquo;admin.user.password.update&rsquo;</li>
<li>字母最后单词为操作。查询:<code>get</code>;新增:<code>add</code>;更新:<code>update</code>;删除:<code>delete</code>;上传:<code>upload</code>;等</li>
</ul>
</li>
</ul>
<h4 id="222"><a name="user-content-222" href="#222" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.2.2. 错误码</h4>
<blockquote>
<p>错误码配置：<code>app/Services/ApiServer/Error.php</code></p>
</blockquote>
<p>命名规范：</p>
<table>
<thead>
<tr>
<th>类型</th>
<th>长度</th>
<th>说明</th>
</tr>
</thead>
<tbody>
<tr>
<td>系统码</td>
<td>3</td>
<td>同<code>http状态码</code></td>
</tr>
<tr>
<td>公共错误码</td>
<td>4</td>
<td>公共参数错误相关的错误码</td>
</tr>
<tr>
<td>业务错误码</td>
<td>6+</td>
<td>2位业务码+4位错误码，不足补位</td>
</tr>
</tbody>
</table>
<p>现有错误码：</p>
<table>
<thead>
<tr>
<th>错误码</th>
<th>错误内容</th>
</tr>
</thead>
<tbody>
<tr>
<td>200</td>
<td>成功</td>
</tr>
<tr>
<td>400</td>
<td>未知错误</td>
</tr>
<tr>
<td>401</td>
<td>无此权限</td>
</tr>
<tr>
<td>500</td>
<td>服务器异常</td>
</tr>
<tr>
<td>1001</td>
<td>[app_id]缺失</td>
</tr>
<tr>
<td>1002</td>
<td>[app_id]不存在或无权限</td>
</tr>
<tr>
<td>1003</td>
<td>[method]缺失</td>
</tr>
<tr>
<td>1004</td>
<td>[format]错误</td>
</tr>
<tr>
<td>1005</td>
<td>[sign_method]错误</td>
</tr>
<tr>
<td>1006</td>
<td>[sign]缺失</td>
</tr>
<tr>
<td>1007</td>
<td>[sign]签名错误</td>
</tr>
<tr>
<td>1008</td>
<td>[method]方法不存在</td>
</tr>
<tr>
<td>1009</td>
<td>run方法不存在，请联系管理员</td>
</tr>
<tr>
<td>1010</td>
<td>[nonce]缺失</td>
</tr>
<tr>
<td>1011</td>
<td>[nonce]必须为字符串</td>
</tr>
<tr>
<td>1012</td>
<td>[nonce]长度必须为1-32位</td>
</tr>
</tbody>
</table>
<h4 id="223-api-demo"><a name="user-content-223-api-demo" href="#223-api-demo" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>2.2.3. API DEMO 示例</h4>
<p>文件路径：<code>app/Services/ApiServer/Response/Demo.php</code></p></article></body></html>